That's just school shootings, not all mass shootings. What is a mass shooting to you, more than 2, evidently. Guess I can't directly refute that, but to me, you need more.
Also, will a psycho that can't get a gun find another method every time?
I'm not a psychologist, but if you're mentally unstable enough to want to kill people that badly, not getting a gun isn't gonna stop you. --- Falco New World Order: http://i.imgur.com/iOYw6Ss.png http://imgur.com/dIifHyi